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List of Blue Moons


The phrase once in a blue moon is used for for rare events. The second full moon in a month is called a blue moon. It occurs every two or three years, always on the 30th or 31st of a month. Sometimes, like in 2018, it is twice in a year, then inevitably in January and March. The span between two full moons is about 29.5 days and only February has less than that, so there is never a blue moon in February. You will find each moon phase in the lunar calendar.


Blue Moons 1971 - 2037

December 31, 1971
October 31, 1974
July 30, 1977
March 31, 1980
December 30, 1982
July 31, 1985
May 31, 1988
December 31, 1990
September 31, 1993
July 30, 1996
January 31, 1999
March 31, 1999
November 30, 2001
July 31, 2004
June 30, 2007
December 31, 2009
August 31, 2012
July 31, 2015
January 31, 2018
March 31, 2018
October 31, 2020
August 31, 2023
May 31, 2026
December 31, 2028
September 31, 2031
July 31, 2034
January 31, 2037
March 31, 2037

The original meaning of blue moon was different. A normal season (spring, summer, autumn, winter) had three full moons, called first, second and last. When there were four full moons in a season, the third one was called blue moon.


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